A circular-shaped item designed to maintain predetermined distance between assembled parts and/or for distributing pressure or preventing endwise movement between member parts. It has a solid cross-section and two flat parallel bearing surfaces. The distance between the bearing surfaces perpendicular to the axis of the centrally located hole shall not exceed 25 percent of the outside diameter. The diameter of the centrally located hole must exceed 75 percent of the outside diameter. Excludes laminated items. For items manufactured from impregnated graphite or lubricated nonmetallic materials, excluding felt or plastics, see gasket. For items manufactured from lubricated plastics, see bearing, washer, thrust. For items manufactured from lubricated felt, see felt, mechanical, preformed. Excludes disk, valve; insulator washer; and shim. See also spacer, plate and spacer, sleeve.
Dept. of the Navy 
Portugal 
Greece Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 5975-01-008-2164
NSN 5935-00-334-0401
NSN 6320-01-449-1014
NSN 5925-01-537-1140
NSN 5975-01-112-3526
NSN 5915-01-033-9967
NSN 5960-01-269-6045
NSN 6240-01-287-8032
NSN 6135-00-194-9354
NSN 6145-01-003-8665
NSN 5915-00-278-5561
NSN 5965-01-348-0079